Explosive assembly



March 8, 1932. vv. R. FARREN EXPLOS IVE AS SEMBLY Filed Nov. 5, 1950 ,gg Z INVENTOR.

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- Patented Mar. 8, 1932 R. FARBEN, OFMTAMAQUA, PENNSYLVANIA., ASSIGN'OR T0 .ATLAS POWDER COMPANY, F WILMINGTON, DELAWAREWA CORPORATION OF'DELAWARE EXPLOSIVE ASSEMBLY .Application led November 5, 1930, Serial No. 493,610.

This invention "relates to 'certain new "and useful improvements in explosive assemblies.

. It has for its object, the provision of a rigid waterproof blasting cartridge, the shell or envelope being of non-sparking materials, and so constructed as to eliminate any possibility of rupturing or tearing during handling and loading into bore boles, and in addition to have a high degree of water resistance. In this latter respect it is believed to be superior to any blasting cartridge shell used heretofore in theexplosive industry, with the one exception of the Waterproofed fabric type outlined in the pending patent applications of R. L. Hill, Serial Number 436,888 filed March 18, 1930, now Patent N o. 1,824,141, and Serial Number 439,07 7 tiled March 26, 1930.

Itis a well known fact that in a large percentage of blasting operations water is present in varying amounts.' The presence of walter is in most cases objectionable since it necessitates special preparation of the bore holes and modification of 'blasting precedure, or

the selection of a highly water resistant ex- I majority of cases, the holes fill up again quite quickly. In such instances, where an explosive, possessing mediocre or po'or water resistance, is used, it is obviously necessary to load and lire the holes Within'a short period of time, or the efficiency of the explosive will be seriously affected. This 1lbrocedure not onlyA reduces the speed and e ciency of loading,

but also impairs the blasting eticiency-of the explosive, since the results obtained in shooting several holes at one time are superior to those obtained whenl shooting the same number, one or two at atime.

, The use of 'explosives that inherently Jhave paratively expensive. They'are in addition,

invariably very dense andalmost withoutexception, have high velocity of detonation,

My invention, hereinafter set forth, proy vides a waterproof cartridge shell of such efiiciency that the selection of explosives for wet blasting conditions maybe based alone on their explosive properties and costs; their water resistance being eliminated entirely from consideration. For example, a certain Wet stripping operation may require the slow, heaving action of a low explosive, such as black blasting powder, to provide themost desirable effectiveness and cost. Heretofore, a more expensive, highly water resistant gelatin dynamite would have to be substituted, with poorer effectiveness resulting. With my invention, the proper type of non-water resistant explosive may be used, even under the most severely wet conditions.

lVithout restricting the invention thereto, describe the same with reference to the embodiment thereof illustrated in the accompanying drawings. v

Figure 1 is a perspective-view of on`e end of a cartridge constructed in accordance with the invention.

Figure 2 is a vertical sectional view. illustrating one embodiment of the invention.

Figure 3 is a vertical sectional view illustrating another embodiment of the invention. Usually both ends 4ofthe cartridge will be alike, although the invention is not limited in this respect. The explosive' assembly of the present/invention differs from the commonly used explosive assemblies in that it embraces the idea of utilizing a preformed carton-like receptacle of such stiffness and In the drawings, 5 designates a cylindrical carton-like body adapted to receive 4explosive e material in any suitable form, indicated at 6.

A reinforcing cap 7 is adapted to lit down upon Xthe cylindrical body 5 in such manner that its outer face will lie flush with the outer face ofthe body 5. 8 designates a cap of flexible waterproof material such as rubber cloth or otherwise. A ring or band 9 is adapted to slide down over the cap 7 and body 5 and bind the lower portion of the flexible cap .8 in place. In` the form of the invention in the manner previously described. It is .illustrated in Figure 3, the cylindrical carton-like body 5a receives-the explosive material 6a and any suitable' form of plug`7a is 'disposed outwardly of the explosive ma.- terial and constitutes the reinforcing element for the exible waterproof cap or sheet 8' which is bound in place by a ring or band 9a common practice in the paper manufacturing industry to make relatively stiff paper cartons in many different ways and of many different materials. Sometimes they are made of a single thickness of material and other times they are made in laminated form with the -various pliesv cemented together. I con` template the use of any of the known methods 'of manufacturing the cartons or receptacles 5, 5a. Where 'these cartons comprise a plurality of plies of material, I contemplate the use of suitable asphaltic or other waterproofing compositions to insure that the'completed structure will be wholly waterproof throughout its length. I contemplate the use ofsolid manila paperboard, straw-'chip `paperboard orany other suitable non-sparkingl material,

in this relation. It should be'clearly understood, however, that any one' or'combination of more than one non-sparking materials may be used and that they may beheld together and w-aterproofed by any suitable material or materials, without being outside the scope of my invention, as long as the resulting cylindrical wall body is sufficiently sturdy and waterproof for use with my novel assembly. Examples of suitable non-sparking materials are cardboard, heavy paper, fiber, pressed pulp, straw chip board, solid manila paperboard, sheet aluminum, etc., whereas examples of suitable adhesive and Water-proofing materials are paraflin wax, mineral tar,

animalpitch, waterproof glue, nitrocellulose cement, etc. I

The reinforcement cap is preferablyof a cheap, non-sparking material such as' paperboard, which is capable of being pressed into the desired shape and has the desired 'stren h, although any other suitablematerial may used, for this purpose, without being outside the scope of my invention. Further, the means of reinforcing the 'flexible waterproof cap may take other forms, 'as for example: rigid flanged plugs', rigid unflanged -plu s (he d in place either by the contents of t e shell as in Figure 3 or by tacks), rigid explosive contents such as pelleted black powder, and the like.

For the waterproofcap I prefer touse a.

circular piece of flexible rubberized cloth. However, any material or shape of cap that will furnish the required waterproofing, such as treated or untreated fabric, various types of paper, sheet rubber, rubber caps, etc., may be used without being outside the scope of my invention. I have found, by experiment, that lrigid waterproof caps are less desirable for my purpose that non-rigid or flexible waterproof caps, because they are more diiiicult to seal on to the cylindrical wall body Y and retaining effect, such as those constructedj of adhesive tape, friction tape, rubber tape, rubber bands, insulated non-sparking wire, etc., are within the scope of my invention.

The cap7 is formed to fit over the end of the cylinder very snugly and is applied before the waterproofed fabric; it being cemented in place with molten asphalt or other cementing material, which will insure the desired degree of waterproofing. In addition to contributing towards the water resistance of the assembly the cap furnishes the required physical strength to the ends of the container. The waterproof fabric is also applied with the aid of a cementing material, and, as noted before, is held in position by the retaining band 9. This band is originally constructed so as to slide freely over the cap and cylinder but due to the introduction` of 'the cementing material, contributes an appreciable binding effect to the completed assembly.

The total assembly, loaded with the explosive, may be dipped in 'paraffin to contribute still further water resistance, and may be equipped with any known form of cartridge lowering attachmentsuch for example as that disclosed in the pending patentv application of W. R.' Farren, Serial Number 483,930, filed September 23, 1930.

Having described my invention, what I claim is LA blasting cartridge shell of the character described, comprising a non-sparking, rigid and waterproof wall body, a flexible cap of rubberized fabric cemented in place over each end with molten asphalt, a non-sparking reinforcement plug for each end and nonsparking annular retention bands to hold said caps on each end of the cylindrical wall body.

2. Ablasting cartridge shell bof the character described, comprising a non-sparking, rigid and waterproof wall body; a flexible, waterproof cap for each end, a snug itting formed fiber reinforcement cap cemented in place' over each end with molten asphalt and .annular retention bands of non-sparking magether with molten as haltic compounds; waterproof caps of ru berized fabric, cemented in place on each end with molten asphaltic compounds; a snug-fitting` reinforcement cap for each end and non-sparking annular retention bands to hold said waterproof caps on each end of the cylindrical wall body.

4. A blasting cartridge shell of the character described comprising a rigid, Waterproof body of laminated paperboard construction, the two or more plies being cemented together with molten asphaltic compounds, Waterproof caps of rubberized fabric cemented in place over each end With molten asphaltic compounds, a snug-fitting reinforcement cap of formed fiber cemented over each end with molten asphaltic compounds and annular retention bands to hold said waterproof fabric caps on each end of the cylindrical Wall body and in completely enclosing relation to the reinforcement caps.

5. A blasting cartridge shell of the charl acter described, comprising a non-sparking,

laminated, cylindrical wall body having two or more plies cemented together with a Waterproof compound; a snug-fitting reinforcement cap or plug for each end, a flexible, Waterproof cap fitted over said reinforcement plug or cap at each end; and a non-sparking, annular band retaining said Waterproof cap at each end.

6. In an explosive assembly, a carton-like cylindrical body adapted to receive explosive material, a reinforcing element closing`the end thereof, a sheet of snug-tting flexible Waterproof material disposed over said reinforcing element, and an annular binding member of non-sparkingmaterial binding said sheet of flexible material about said body, said binding material being disposed a material distance inwardly of said reinforcing element.

7. In an explosive assembly, a carton-like cylindrical body adapted to receive explosive material, a reinforcing element closing the end thereof, a sheet of flexible waterproof material cemented over said reinforcing element and about said body and an annular binding member of non-sparking material binding said sheet of flexible material about said body, said annular binding member being of such diameter as to adapt it to slide down over said cylindrical bodyto a point below said reinforcing element, and to forcibly press the inner portion of the cemented waterproof sheet into engagement with the Wall of said cylindrical body.

8. An explosive assembly comprising a rigid self-supporting paper cylindrical body, a reinforcing cap for closing the upper end thereof, a sheet of flexible Waterproof material fitted over said cap and extending materially therebelow, said cap being cemented upon said body with a waterproofing composition and said flexible,v material being ce mented upon the cap and body by a waterproofing composition, and a sliding band of non-sparking material adapted to slide down over the flexible material, cylindrical body and cap to bind said exible material in place as described.

9. An explosive assembly comprising a rigid supporting paper cylindrical body, a reinforcing cap closing the end thereof and so associated with the cylindrical body as to leave the exterior surface of the assembly of uniform diameter throughout its length', a cap of snugly fitting Waterproof fabric fitted over'the end of the container and extending a material distance inwardly of the reinforcing closure cap, said cap of waterproof material being cemented in place by waterproof material, and a band of non-sparking material slidably fitted over said cap of flexible Waterproof material and of such internal diameter as to constrict the waterproof fabric against the cemented surface of the body portion, inwardly of the' reinforcing cap.

l0. A blasting cartridge of the character described comprising a body of explosive material,- a shell comprising a non-sparking rigid and Waterproof cylindrical wall body,

an imperforate non-sparking Waterproof cap rial.

In testimony whereof he aliixeshis signa- WILLIAM R. FARBEN.

I ture.

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